The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

Infamous marsh filled with toxic waste, World War II-era London rubble, and dead mobsters galore.

This stunning and ethereal mural symbolizes the beauty, unity, and diversity of humankind.

Not everything is bigger in Texas.

Once called the Jersey Lilly, this former saloon was the domain of infamous Judge Roy Bean.

The notorious couple camped at this site after a bloody shootout with police.

Lured here by the promise of tens of thousands in gold, Jesse James started a quintessentially American trend of robbing trains in-motion.

Millions of dollars worth of sculpture decorate this Iowa city center.

This simple home was the beginning of a long journey for the iconic Western film star.

The "World's Largest Underground Business Complex," a 55,000,000-square-foot city underneath Missouri.

For decades, Puerta del Sol has been illuminated by a giant, guitar-wielding bottle of sherry.

Come face to face with the ferocious visage of the serpent-headed mother goddess of the Aztecs.

An ossuary built in 1210 to collect bones from the Ospedale Maggiore of Milan.

Mexico City's largest market contains a Willy Wonka-esque wonderland.

This historic street in Quito is known for its seven stone crosses—and one presidential assassination.

One of the most spectacular bridges in Spain spans a narrow chasm that divides the city of Ronda.

Found down a long dirt road, a sacred Mexican cenote and 18th-century hacienda remain hidden.

A short volcanic hill in Quito doubles as a stellar observation point of an iconic statue.

Milan's duomo is covered in beautiful carving including a curious "dinosaur-like" beast.

Two very green residential towers cleaning the air in one of Europe's most polluted cities.

It took 160 years to complete the most ornate church in Ecuador.

Once home to an aristocratic family and a workers' organization, this intricately tiled building now houses a chain restaurant.

The striking jade death mask of an ancient Maya king is displayed in a replica tomb in Mexico City.

This unusual lava tube spouts seawater during high surf.